Provision of Website Migration and Managed Services, Drupal Multi-Site Environment

IOM currently operates a large-scale Drupal multi-site web ecosystem hosted on Acquia Cloud using Acquia Cloud Site Factory (ACSF). The environment supports 279+ active websites, comprising the iom.int corporate website and a portfolio of regional mission, country, thematic programme, and campaign sites. The environment receives approximately 40 million visits per month and processes approximately 1.2 billion edge requests per quarter, with an enterprise CDN and WAF layer providing edge security and performance. The platform follows a single codebase, multi-site architecture managed through Acquia Site Factory, where all websites share a common Drupal codebase, each site has a dedicated database, and each site has isolated file storage (public and private). The platform provides centralised multisite management, automated site provisioning and lifecycle management, and integrated deployment workflows and environment management. IOM CI/CD pipeline is integrated with Azure DevOps for code deployment across all environments. Following a strategic review of IOM hosting model, DICT has determined that it is in IOM interest to migrate away from the current third-party managed arrangement. The primary drivers are to reduce dependency on a single proprietary managed platform, improve cost transparency, strengthen IOM direct control over its digital infrastructure, and transition to an architecture that avoids vendor lock-in. IOM preferred outcome is to host these websites on IOM-owned cloud infrastructure (AWS or GCP) under a single-tenancy build managed by a specialist vendor. This RFP invites proposals for: (a) a full technical assessment of the current Acquia environment and a migration plan; (b) execution of the migration under IOM preferred model or an approved alternative; and (c) the provision of ongoing managed services for the resulting environment.